Driving dynamics system, vehicle and method for operating a driving dynamics system

Abstract

A driving dynamics system for a vehicle may include at least one wheel brake for dissipative braking of a wheel of the vehicle; at least one braking unit associated with the at least one wheel brake and designed to generate a dissipative braking torque via the at least one wheel brake; at least one electric traction motor controllable to generate a regenerative braking torque for at least one wheel or axle of the vehicle; and a central control unit configured to control the at least one brake unit and the at least one electric traction motor for a braking function in combination such that a combined braking torque is generated by means of the at least one brake unit and the at least one electric traction motor. The braking function relates to simultaneous control of a basic braking torque and a controlled additional braking torque.

1 .- 24 . (canceled) 
     
     
         25 . A driving dynamics system for a vehicle, comprising:
 a wheel brake for dissipative braking of a wheel of the vehicle;   a brake unit which is associated with the wheel brake, and which is designed to generate a dissipative braking torque by means of the wheel brake;   at least one electric traction motor which is enabled to be controlled to generate a regenerative braking torque for at least one wheel or at least axle of the vehicle; and   a central control unit designed to control the brake unit and the electric traction motor for a braking function in combination with one another such that a combined braking torque is enabled to be generated by means of the brake unit and the electric traction motor;   wherein the braking function relates to a braking control process in which a basic braking torque and a controlled additional braking torque are controlled and/or regulated simultaneously and additively; and   wherein the braking function is selected from among the following functions:
 automatic emergency brake, wherein a total braking torque is distributed unevenly between the rear axle and the front axle with electronic brake force distribution (EBD) control; or 
 anti-lock braking system (ABS) with basic braking torque assistance via the at least one traction motor. 
   
     
     
         26 . The driving dynamics system according to  claim 25 , wherein the central control unit is designed to control the brake unit and the at least one electric traction motor in combination with one another for a function selected from among the following functions:
 electronic stability program (ESP);   electronic brakeforce distribution (EBD);   anti-skid control (ASC);   distance control (Automated Cruise Control, ACC);   recuperation management for axle- or wheel-specific recuperation;   basic braking with thermal management;   yaw moment control in case of failure of a wheel brake; or   yaw moment intervention control for steering assistance.   
     
     
         27 . The driving dynamics system according to  claim 25 , wherein the brake unit comprises an electric motor drive and is embodied as an electrohydraulic brake unit or as an electromechanical brake unit. 
     
     
         28 . The driving dynamics system according to  claim 25 , wherein during the braking control process, a total braking torque is built up or reduced simultaneously by the basic braking torque and the controlled additional braking torque. 
     
     
         29 . The driving dynamics system according to  claim 25 , wherein the central control unit is configured redundantly with three microcontrollers to implement a 2-out-of-3 architecture;
 and/or   the central control unit is connected to the brake unit and the electrical traction motor via multiple data lines;   and/or   the central control unit includes a microcontroller and a memory dimensioned in the gigabyte range, such that an automated application is enabled to be carried out via learning algorithms or artificial intelligence (AI), both before the vehicle is put into operation and subsequently during normal operation without faults, as well as adapted operation when a fault occurs;   and/or   the central control unit is coupled to at least one brake unit control unit of the brake unit.   
     
     
         30 . The driving dynamics system according to  claim 25 , wherein the central control unit is configured to receive data from wheel speed sensors of the wheels of the vehicle and/or further sensor signals, wherein the further sensor signals are provided by yaw moment sensors, acceleration sensors, and/or weight sensors;
 and/or   the central control unit is configured to transmit target signals to a motor control unit of the at least one traction motor and to a brake unit control unit of the brake unit in the braking function.   
     
     
         31 . The driving dynamics system according to  claim 25 , wherein the central control unit is configured to control the at least one electric traction motor for regenerative braking of the vehicle when the vehicle speed is above 80 km/h for braking in normal operation;
 wherein during regenerative braking, an electronic brakeforce distribution (EBD) is simultaneously implemented on a front axle and a rear axle of the vehicle;   wherein 20-40% of a total braking torque acts on the rear axle and 60-80% of the total braking torque acts on the front axle of the vehicle, wherein a total braking torque at the rear axle is provided exclusively by the at least one electric traction motor.   
     
     
         32 . The driving dynamics system according to  claim 25 , wherein the wheel brake of the wheel of the vehicle is associated with its own brake unit, wherein the brake unit is electromechanical; wherein for two wheels of the vehicle, including the wheel of the vehicle, the brake unit associated with the wheel brake and a brake unit associated with a second wheel brake and a respective electric traction motor are integrated into respective wheel modules; wherein in case of failure of a brake unit or electric traction motor of one of the wheel modules, the wheel module that has not failed takes over generating braking torque and controlling braking torque for ABS. 
     
     
         33 . The driving dynamics system according to  claim 25 , wherein a common electrohydraulic brake unit is associated with wheel brakes of two wheels of a front axle of the vehicle,
 wherein all brake units have individual control units and are able to be controlled by an electrical control signal from the central control unit; and   wherein a hydraulic connection is provided to a brake unit for generating braking torque at at least one wheel of a rear axle of the vehicle by means of a hydraulic brake unit, wherein the hydraulic connection is switchable by means of a solenoid valve.   
     
     
         34 . The driving dynamics system according to  claim 25 , wherein a central brake unit is associated with wheel brakes of four wheels of the vehicle;
 wherein the central brake unit has an electrohydraulic design;   wherein the central brake unit has its own control unit and is able to be controlled exclusively by the central control unit via an electrical control signal; and   wherein the central brake unit further is redundantly configured with two power supplies and/or two control units.   
     
     
         35 . The driving dynamics system according to  claim 25 , wherein a common electrohydraulic brake unit is associated with wheel brakes of two wheels of a first axle of the vehicle;
 wherein for the wheel brakes of the first axle, wheel-specific dissipative braking torques are adjustable by means of solenoid valves in hydraulic lines between the electrohydraulic brake unit and the wheel brakes of the first axle;   wherein the electrohydraulic brake unit is also connectable via a hydraulic line to wheel brakes of two wheels of a second axle of the vehicle; and   wherein common, non-wheel-specific dissipative braking torques are able to be set for the wheel brakes of the second axle.   
     
     
         36 . The driving dynamics system according to  claim 25 , wherein the central control unit is designed to distribute the basic braking torque and the controlled additional braking torque to the brake unit and the at least one electric traction motor as a function of vehicle deceleration and/or as a function of a coefficient of friction of the road. 
     
     
         37 . The driving dynamics system according to  claim 25 , wherein the central control unit includes redundant microcontrollers and a memory dimensioned in the gigabyte range, and is designed to acquire sensor data during vehicle operation and to adapt control of the braking function on the basis of the acquired sensor data by means of an artificial intelligence method that is capable of being implemented by the redundant microcontrollers of the central control unit, wherein adaptation of the control of the braking function is performed when the vehicle is parked, based on the acquired sensor data, a characteristic map is determined, wherein the characteristic map is adaptable based on the acquired sensor data and the artificial intelligence process if a deviation from a current characteristic map is detected. 
     
     
         38 . A driving dynamics system for a vehicle, comprising:
 at least one electric traction motor controllable to generate a regenerative braking torque for at least one wheel or axle of the vehicle; and   a central control unit configured to control the at least one electric traction motor for a braking function, wherein the braking function relates to a braking control process of an anti-lock braking system (ABS) braking control or an electronic stability program (ESP) braking control wherein the central control unit is designed to carry out the braking function when braking on snow, ice, and/or wet roads, with low to moderate decelerations of less than 0.5 m/s 2 ,   wherein the central control unit is configured to carry out the braking function by means of at least one traction motor of at least one axle of the vehicle.   
     
     
         39 . A vehicle with the driving dynamics system according to  claim 25 . 
     
     
         40 . A method for operating a driving dynamics system having at least one brake unit configured to generate a dissipative braking torque and at least one electric traction motor configured to generate a regenerative braking torque for at least one wheel or axle of the vehicle, and a central control unit configured to control the at least one brake unit and the at least one electric traction motor to implement a braking function, wherein the method comprises:
 generating a combined braking torque is generated by means of the at least one braking unit and the at least one electric traction motor, wherein the braking function relates to a braking control process in which a basic braking torque and a controlled additional braking torque are controlled and/or regulated simultaneously and additively, including controlling the at least one brake unit and the at least one electric traction motor to respectively or in combination generate the basic braking torque and the controlled additional braking torque, wherein the braking function is selected from among the following functions:
 automatic emergency brake (AEB), wherein a total braking torque is distributed unevenly between a rear axle and a front axle of the vehicle; or 
 anti-lock braking system (ABS) with basic braking torque assistance via the at least one traction motor.